Fresh in from the ASPCA... and a few other doggy websites is this list (actually two parts) of poisonous plants to keep your pups from chewing on...
Angel Trumpet (all of the plant)
Azalea( all)
Bittersweet (leaves and fruit)
Buckthorn ( all)
Caladium (all)
Castor Bean (all)
Chinese Lantern (all)
Chrysanthemum (all)
Daffodil (bulb)
Delphinium (all)
English Ivy (all)
Foxglove (leaf and seeds)
Geranium (all)
Gladiola (bulb)
Holly (all)
Horse Chestnut (flower, sprout and seeds)
Hyacinth (bulb)
Iris (all)
Jerusalem Cherry (leaf, unripe fruit)
Lily of the Valley (all)
Mistletoe (all)
Mushrooms (all of certain types)
Narcissus (all)
Nightshade (all)
Oleander (all)
Peony (roots)
Philodendron (all)
Potato (sprouts, vines, unripe tubers"
Rhododendron (all)
Rhubarb (roots & leaves)
Sago Palm (all, especially seeds)
Trumpet Lily (all)
Vinca Vine (all)
Wandering Jew (leaf)
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More!! From the ASPCA
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Alphabetical listing of poisonous plants by common name
Poisonous Plants by Category
Bulbs: Amaryllis, Autumn Crocus, Daffodil, Day Lily, Elephant Ears, Gladiolas, Hyacinth, Iris, Lily of the Valley, Narcissus, Orange Day Lily, Tulip
Ferns: Aparagus Fern, Australian Nut, Emerald Feather (aka Emerald Fern), Emerald Fern (aka Emerald Feather), Lace Fern, Plumosa Fern
Flowering Plants: Cyclamen, Hydrangea, Kalanchoe, Poinsettia
Garden Perennials: Charming Diffenbachia, Christmas Rose, Flamingo Plant, Foxglove, Marijuana, Morning Glory, Nightshade, Onion, Tomato Plant, Tropic Snow Dumbcane
House Plants: Ceriman (aka Cutleaf Philodendron), Chinese Evergreen, Cordatum, Corn Plant (aka Cornstalk Plant), Cutleaf Philodendron (aka Ceriman), Devil's Ivy, Dumb Cane, Golden Pothos, Green Gold Nephthysis, Marble Queen, Mauna Loa Peace Lily, Nephthytis, Peace Lily, Red-Margined Dracaena, Striped Dracaena, Taro Vine, Warneckei Dracaena
Lillies: Asian Lily (liliaceae), Easter Lily, Glory Lily, Japanese Show Lily, Red Lily, Rubrum Lily, Stargazer Lily, Tiger Lily, Wood Lily
Shrubs: Cycads, Heavenly Bamboo, Holly, Jerusalem Cherry, Mistletoe "American", Oleander, Precatory Bean, Rhododendron, Saddle Leaf Philodendron, Sago Palm, Tree Philodendron, Yucca
Succulents: Aloe (Aloe Vera)
Trees: Avocado, Buddist Pine, Chinaberry Tree, Japanese Yew (aka Yew), Lacy Tree, Macadamia Nut, Madagascar Dragon Tree, Queensland Nut, Schefflera, Yew (aka Japanese Yew)
Vines: Branching Ivy, English Ivy, European Bittersweet, Glacier Ivy, Hahn's self branching English Ivy, Needlepoint Ivy
Misc/Uncategorized: American Bittersweet, Andromeda Japonica, Azalea, Bird of Paradise, Buckeye, Caladium hortulanum, Calla Lily, Castor Bean, Clematis, Fiddle-Leaf Philodendron, Florida Beauty, Fruit Salad Plant, Golden Dieffenbachia, Gold Dust Dracaena, Heartleaf Philodendron, Horsehead Philodendron, Hurricane Plant, Mexican Breadfruit, Mother-in-law, Panda, Philodendron Pertusum, Red Emerald, Red Princess, Ribbon Plant, Satin Pothos, Spotted Dumb Cane, Sweetheart Ivy, Swiss Cheese Plant, Variable Dieffenbachia, Variegated Philodendron, Yesterday/Today/Tomorrow